succinimido (1,5-naphthyridin-3-yl)formate, 4-hydroxy-1,5-naphthyridine-3-carboxylic acid N-hydroxy succinimide ester, 4-hydroxy-1,5-naphthyridine-3-carboxylic acid N-hydroxysuccinimide ester, 4-Hydroxy-[1,5]naphthyridine-3-carboxylic acid 2,5-dioxo-pyrrolidin-1-yl ester,